Which of the following best describes wave frequency?

Wave frequency is defined as the number of complete wave cycles that pass a specific point in a unit of time, usually measured in hertz (Hz). One hertz corresponds to one cycle per second. This concept is crucial because it helps us understand how quickly waves oscillate. For example, a wave with a higher frequency will complete more cycles in the same amount of time compared to a wave with a lower frequency.

To clarify the other options, the distance between successive crests refers to wavelength, which describes the spatial extent of a wave rather than its frequency. The height of the wave from crest to trough is referred to as amplitude, which indicates the wave's energy but does not provide information about how often the waves cycle. Lastly, the speed at which a wave travels is related to both frequency and wavelength but is not synonymous with frequency itself. Thus, the correct description of wave frequency aligns with the understanding of wave behavior and is fundamental in wave phenomena.